California Code, Health and Safety Code - HSC § 25299.76

(a) Any person who violates any requirement of Article 3 (commencing with Section 25299.30) or Article 4 (commencing with Section 25299.36) is liable for a civil penalty of not more than ten thousand dollars ($10,000) for each underground storage tank for each day of violation.

(b) The state or a local agency may bring an action in superior court to impose the civil penalty specified in subdivision (a).

(c) The board or a regional board may impose the civil penalty specified in subdivision (a) pursuant to Article 2.5 (commencing with Section 13323) of Chapter 5 of Division 7 of the Water Code.

(d) In determining the amount of any liability imposed under this section, the superior court, the board, or the regional board shall take into account the nature, circumstances, extent, and gravity of the violation, and, with respect to the violator, the ability to pay, any prior history of violations, the degree of culpability, the economic benefits or savings, if any, resulting from the violations, and other matters as justice may require.

(e) Remedies under this section are in addition to, and do not supersede or limit, any other civil or criminal remedies, except that no civil penalties shall be recovered under this section for violations for which a civil penalty is recovered pursuant to Section 13268 or 13350 of the Water Code.